The research of the uniformity of the restored rotor layer of a turbocharger for machine and tractor park of agricultural enterprises

The paper is devoted to the research of the uniformity of the sprayed layer on the worn surface of the turbocharger rotor for MTP. It has been established that in the process of flame spraying, the non-uniformity of applying the molten powder to the worn surface of the rotor was revealed. Therefore, the effect of technological parameters (speed of rotation of the rotor blank and fraction of the flux powder) on the size of the deposited layer was studied using the method of planning the experiment. Both technological factors in the studied range of values have a positive effect. However, their action is independent of each other. The effect of the particle diameter of the flux powder exceeds by 3 times the effect of the rotation of the rotor shaft on the increase in the sprayed layer. The results of the experiment showed that its average value was 13 mm. On the other hand, studies have shown that, in the process of restoring the worn surface of the rotor, radial and axial backlash occur, which affects the formation of a uniformly sprayed layer and can lead to a defect, the fixation method also has an effect. For the technology of restoring worn surfaces of rotors, a specially designed device for fixing the rotor in the lathe chuck is proposed in the work. The design of the newly developed fixture consists of sectors that allow rotors for various types of turbochargers to be fixed in the clamping jaws of the chuck of the same lathe. In addition, the designs of newly developed devices are distinguished by the presence of a fixing board. The developments proposed in the paper made it possible to avoid the occurrence of backlash and deformation of the rotor blank in the process of flame spraying of its restored surface.